The Topaz: Wout van Gils GENERAL The effect of the topaz factor is mainly reflected in the reduction of the black eumelanin present, which we also only find in the black and agate series. The characteristics that must be clearly visible is a concentrated location of the eumelanin around the shaft of the feathers. So dark centrally located eumelanin and clear border. In addition, the shaft of the feathers should be colorless, which is clearly visible in the tail and wing feathers.
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